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   难度：Easy
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   <h1 class="question_title">
    182. Duplicate Emails
   </h1>
   <p>
    Write a SQL query to find all duplicate emails in a table named
    <code>
     Person
    </code>
    .
   </p>
   <pre>
+----+---------+
| Id | Email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+
</pre>
   <p>
    For example, your query should return the following for the above table:
   </p>
   <pre>
+---------+
| Email   |
+---------+
| a@b.com |
+---------+
</pre>
   <p>
    <strong>
     Note
    </strong>
    : All emails are in lowercase.
   </p>
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   <h1 class="question_title">
    182. 查找重复的电子邮箱
   </h1>
   <p>
    编写一个 SQL 查询，查找&nbsp;
    <code>
     Person
    </code>
    表中所有重复的电子邮箱。
   </p>
   <p>
    <strong>
     示例：
    </strong>
   </p>
   <pre>+----+---------+
| Id | Email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+
</pre>
   <p>
    根据以上输入，你的查询应返回以下结果：
   </p>
   <pre>+---------+
| Email   |
+---------+
| a@b.com |
+---------+
</pre>
   <p>
    <strong>
     说明：
    </strong>
    所有电子邮箱都是小写字母。
   </p>
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